This study investigated the differential toxicities of anionic and nonionic surfactants commonly used as active ingredients in household cleaning agents. The acute toxicity of the surfactants against Clarias gariepinus were investigated using static bioassays while the sublethal effects on the biochemical parameters and the histopathology of liver and gills of the fish were investigated for a period of 28&nbsp;days using a static renewal bioassay. The anionic surfactants were found to be more acutely toxic against the fish than the nonionic surfactants. The evaluation of the joint action toxicity of the surfactants against the test species using the concentration-addition model showed antagonistic interactions when the surfactants are present in mixtures. The two groups of surfactants also had varying degree of effects on the antioxidant stress enzymes and the liver function enzymes of the fish. However, only the anionic surfactants caused changes in the histopathology of the gills of the fish. The results obtained from this study have shown that anionic surfactants are more toxic to fish compared to nonionic surfactants. Anionic surfactants are the most commonly used surfactants in cleaning agents, there is a need for stricter regulations governing the use of this class of surfactants in cleaning agents.The microalga Scenedesmus obtusiusculus AT-UAM efficiently captured CO2 from two flue gas streams in a hybrid photobioreactor located in a greenhouse. Uptake rates of CO2, NO, and SO2 from a formulated gas stream were 160.7&nbsp;mg&nbsp;L-1&nbsp;day-1, 0.73&nbsp;mg&nbsp;L-1&nbsp;day-1, and 1.56&nbsp;mg&nbsp;L-1&nbsp;day-1, respectively, with removal efficiencies of 100% for all gases. Exhaust gases of a motor generator were also removed with uptake rates of 111.4&nbsp;mg&nbsp;L-1&nbsp;day-1, 0.42&nbsp;mg&nbsp;L-1&nbsp;day-1, and 0.98&nbsp;mg&nbsp;L-1&nbsp;day-1, obtaining removal efficiencies of 77%, 71%, and 53% for CO2, NOx, and SO2, respectively. On average, 61% of the CO2 from both flue gas streams was assimilated as microalgal biomass. The maximum CO2 uptake rate of 182&nbsp;mg&nbsp;L-1&nbsp;day-1 was achieved for formulated flue gas flow rate above 100&nbsp;mL&nbsp;min-1. The biomass recovery of 88% was achieved using a 20-L electro-coagulation-flotation chamber coupled to a settler with a low specific power consumption of 0.27&nbsp;kWh&nbsp;kg-1. The photobioreactor was operated for almost 7&nbsp;months without contamination of invasive species or a decrease in the activity. It is a very encouraging result for long-term operation in flue gas treatment.In this study, it was evaluated and documented the potential uses of the residual fungal biomass from fermentation. The chemical composition of the biomass was determined by instrumental analysis techniques for its characterization and its possible application. It was found that this biomaterial is generally composed of sugars, proteins, and lipids, which provide it certain properties and applications that must be characterized morphologically, chemically, and mechanically. The residual fungal biomass could be used for two processes the extraction of biopolymers, with several applications in the food industry, cosmetics, and pharmaceutical, among others; and the removal of contaminants by mechanisms of adsorption with biopolymers, known also as biosorption, in tertiary treatments of wastewater.This article is an experimental study conducted to evaluate the influence of the use of 0.15% dienitro on the diesel S50 and S10 with EGR (exhaust gas recirculation) system added with dienitro. The tests were performed with a gas analyzer directly on the exhaust of vehicles with engine speed of 1300&nbsp;rpm. Measurements of CO and NOx gas emissions were carried out using a gas analyzer in S50 and S10 diesel buses with an EGR system from a company operating in the collective transport. Twenty measurements were performed without additives and twenty measurements with additivation in each bus, making it possible to calculate the average emission rate of CO and NOx, pollutant gases of toxic effect. https://www.selleckchem.com/products/Tipifarnib(R115777).html The results showed that all additive fuels reduced NOx and CO emissions. This additive has a slight increase of 1 or 1.5 points in cetane number, low vaporization enthalpy (energy to vaporize), and high combustion enthalpy, i.e., dienitro increased cetane number, facilitating the start of combustion and reducing CO. On the other hand, a fuel that releases less energy during combustion consequently produces lower temperatures within the combustion chamber, i.e., additives with lower combustion enthalpy have lower NOx emissions.Silver nanoparticles are potent antimicrobials and could be used as a promising alternative of conventional antibiotics. The aim of this study was to isolate bacteria from soil that have ability to produce AgNPs by secondary metabolite activity and their elucidation against human pathogens. These strains Escherichia coli, Exiguobacterium aurantiacumm, and Brevundimonas diminuta with NCBI accession number MF754138, MF754139, and MF754140 respectively were grown for secondary metabolite production. The nanoparticles were confirmed and characterized by UV-Vis spectroscopy and transmission electron microscopy. The optimization study was also carried out to obtain the maximum production of silver nanoparticles. Three parameters, temperature, pH, and AgNO3 concentration, were used to optimize the production of silver nanoparticles. Antimicrobial potential of these nanoparticles was addressed on the Muller-Hinton Agar, and their zones of inhibitions were measured. TEM analysis revealed the size and shape of the silver nanoparticles. All types of AgNPs were spherical in shape; their size range is from 5 to 50&nbsp;nm. The findings of optimization study showed the maximum production of silver nanoparticles at the pH&nbsp;9, temperature 37&nbsp;°C, and 1&nbsp;mM AgNO3 concentration. All the strains exhibited the great potential as antimicrobial agents against MRSA and several other MDR bacteria with minimum 10&nbsp;mm to maximum 28&nbsp;mm zone of inhibition. It was concluded that the present study is an eco-friendly approach for the synthesis of AgNPs that will be beneficial to control the nosocomial infections triggered by MRSA and other human pathogens.